Delta Sub-Pixel Arrangement for OLED Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic electroluminescent display panels face limitations in aperture ratio and alignment tolerance due to the stripe pixel arrangement structure, which restricts resolution and increases fabrication complexity.
Innovation Solution
A delta arrangement of sub-pixels on a substrate, where each display pixel unit consists of three sub-pixels (blue, green, and red) arranged in a delta configuration, allowing for increased aperture ratio and alignment tolerance by broadening the openings on the shadow mask and reducing fabrication difficulties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a stripe pixel arrangement structure is used with sufficient space among sub-pixels to prevent material mixing, then alignment precision is maintained, but the aperture ratio decreases and resolution is restricted
Solution Approach 1:
The patent transitions from a symmetric stripe arrangement to an asymmetric delta arrangement where sub-pixels of different colors are positioned at the vertices of a triangle. This asymmetric configuration allows sub-pixels to be closer together while maintaining sufficient spacing to prevent material mixing during vapor deposition, thereby increasing the aperture ratio without sacrificing alignment precision
Solution Approach 2:
The patent repositions sub-pixels from a linear stripe arrangement along one dimension to a triangular delta arrangement that utilizes two dimensions. By arranging sub-pixels at the vertices of a triangle, the design creates more efficient space utilization and allows for closer spacing while maintaining adequate separation for fabrication, thus improving aperture ratio
2Manufacturing precision
If sufficient space is provided among sub-pixels to prevent material mixing during vapor deposition, then manufacturing precision is maintained, but device complexity increases due to shadow mask fabrication difficulty
Solution Approach 1:
The asymmetric delta arrangement simplifies shadow mask fabrication by reducing the number of separate opening structures needed compared to traditional stripe arrangements. The triangular configuration allows for more straightforward mask patterning and reduces fabrication steps, thereby decreasing device complexity while maintaining manufacturing precision
Solution Approach 2:
The patent merges the spacing requirements into a unified delta arrangement that simultaneously satisfies alignment precision and fabrication simplicity. By combining multiple spacing constraints into a single geometric configuration, the design reduces the overall complexity of shadow mask fabrication while maintaining the necessary precision for preventing material mixing
3Measurement precision
If the distribution density of sub-pixels is increased to improve resolution, then aperture ratio increases, but alignment tolerance decreases and fabrication difficulty increases
Solution Approach 1:
The asymmetric delta arrangement provides inherent geometric tolerance that accommodates fabrication variations. The triangular configuration naturally distributes alignment errors more effectively than linear stripe arrangements, maintaining alignment tolerance even when sub-pixel density is increased to improve resolution
Solution Approach 2:
The patent changes the geometric parameters of sub-pixel arrangement from linear to triangular configuration. This parameter change creates a more robust alignment tolerance window that can accommodate fabrication variations while still achieving high resolution through increased sub-pixel density and aperture ratio
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The delta arrangement enhances the aperture ratio and alignment tolerance, improving resolution and display quality while simplifying the fabrication process of the shadow mask.
Implementation Method 1
the shadow mask 100M with a plurality of stripe openings 100H extending along a column direction Y is employed to perform a vapor deposition process of organic luminescent materials
Data Source
AI summary
A pixel structure of an electroluminescent display panel includes display pixel units. Each display pixel unit is composed of one first sub-pixel, one second sub-pixel, and one third sub-pixel. Each first sub-pixel is disposed adjacent to another first sub-pixel along a column direction to form a first pixel unit with a first frame. Each second sub-pixel is disposed adjacent to another second sub-pixel along the column direction to form a second pixel unit with a second frame. Each third sub-pixel is disposed adjacent to another third sub-pixel along the column direction to form a third pixel unit with a third frame. Each first, second, and third pixel units respectively have an identical first length along the column direction. Each first pixel unit and one adjacent first pixel unit disposed in a different row are shifted relatively along the row direction by the first length.